The principal mineral used in making glass is:
What will be an ideal response?
quartz
You might also like to view...
When we see a meteor shower, it means that
A) Earth is crossing the orbit of a comet. B) the solar wind is unusually strong. C) an Earth-approaching asteroid has recently come close to our planet. D) you should duck and run for cover to avoid being blasted on the head by a rock from space.
A beam of light is polarized in a vertical plane and has an intensity I0
The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally. If the axis of the polarizer is set at 60° with the vertical, what is the ratio of the intensity of the final beam to I0? A) 0.37 B) 0.43 C) 0.19 D) 0.25 E) 0.31
Determine the drag force acting per unit length in a 1 in diameter steel cable when air at 60ºF, 14.7 psia moves trasnversely (perpendicularly) across the cable at 30 mph.
A rifle sight is set so that you will hit a target at 100m. If, instead, you wish to hit a target closer than 100m, should you aim high or low?
A. You should aim high, since the bullet will drop due to the effect of gravity B. You should aim directly at the target, if the rifle sight is set, it will aim true no matter the distance to the target C. You should aim low, since the bullet will not drop as much as expected due to the effect of gravity